Added public files

Roughly added all public files. Probably missed some, though.
diff --git a/doc/efun/sin b/doc/efun/sin
new file mode 100644
index 0000000..6eab7ec
--- /dev/null
+++ b/doc/efun/sin
@@ -0,0 +1,8 @@
+SYNOPSIS
+        float sin(int|float)
+
+BESCHREIBUNG
+        Liefert den Sinus des Argumentes.
+
+SIEHE AUCH
+        asin(E), cos(E), acos(E), tan(E), atan(E), atan2(E)